The issues regarding Android 5.0 Lollipop and the Google Nexus 5 are not rumours... check https://productforums.google.com/forum/#!searchin/nexus/nexus$205
Further proof: yesterday Android 5.0.1 started rolling out for the Nexus 4 and the Nexus 6, BUT NOT for the Nexus 5... Whatever the cause, something about the Nexus 5 gives Google a hard time... My advice: wait. And keep an eye on feedback.